Pyrus Install

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- Do not include Cache.php since its only a concept and not implemented yet
- fixed serious issue with right reading in the Medium and Complex container
- right_level may not be null in schema (use default if not explicitly set)
- phpdoc improvements
- bumped dependency for MDB2 to first stable release
- added missing optional dependency on mcrypt
- made admin user a superadmin in example4
- bumped copyright to 2006